Single-crystal synchrotron radiation x-ray diffraction study of B and Ga silicates compared to a purely siliceous MFI: a discussion of the heteroatom distribution

Article Abstract:

The structure determinations, obtained by synchrotron radiation single-crystal x-ray diffraction experiments, of as-synthesized orthorhombic MFI boron and gallium silicates compared to that of an unsubstantiated defect-free silicatite was reported. The absence of any measurable signal due to Si (OH) species in the (super 29) Si NMR spectra of silicalite indicates that their defectivity is very low because the samples are almost free of Si vacancies which are usually rather common in MFI materials.

Primary nonferrous metals, not elsewhere classified, Primary Smelting and Refining of Nonferrous Metal (except Copper and Aluminum), All Other Basic Inorganic Chemical Manufacturing, Boron & Compounds, Industrial inorganic chemicals, not elsewhere classified, Silicates, Potash, soda, and borate minerals, Boron, Potash, Soda, and Borate Mineral Mining, Gallium, Boron (Chemical element)

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Iron location in Fe-silicalites by synchroton radiation single crystal X-ray D Diffraction

Article Abstract:

The structural evidence, obtained by synchrotron radiation single-crystal X-ray diffraction experiments, of the presence of preferential substitution sites for iron heteroatoms hosted in the MFI framework of a Na-Fe-silicalite sample is presented. Independent data obtained on single crystals of Fe-silicalite samples synthesized with NH(sub 4)+ and K+ counterions and those obtained on the sodium derivative are found to correlate.

X-ray diffraction, Iron, Iron (Metal)

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Thermal reduction of Cu(super 2+) -mordenite and re-oxidation upon interaction with H2O, O2, and NO

Article Abstract:

A multitechnique [electron paramagnetic resonance (EPR), XANES, EXAFS and IR of absorbed NO] study of the coordination and oxidation chemistry of copper species hosted in mordenite (MOR) zeolite under different conditions is presented. The differences observed between these two systems are explained in terms of the different structural characteristics.

Usage, Copper, Chemistry, Physical and theoretical, Physical chemistry, Electron paramagnetic resonance spectroscopy, Chemical properties

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